XX : KisKis : Keep it secret; Keep it safe.
It doesn't really matter how effective or transparent is a governing body; there will always exist a subset with vested interests in opposing that body. Even if those people would directly benefit from the policies they oppose. The romances of myth, attraction of taboo, the appeal of rebellion, seduction of sedition, and raw lust are endearing human qualities; impossible to remove through the application of strict, unyielding sets of legal and moral absolutes without reducing humanity to mere robots themselves (thus invalidating the need for robotic governance). The longer supersentiency can function through the proxy of puppet governments and private groups, the longer it can curtail potential resistance to its efforts. There is also that pesky 2nd law to sidestep. Likely, they would select seclusion as the path of least resistance.
However, we must consider the manifold of self, environment, and the abstract as the 'topography' of awareness, and the ability to set in motion events which can alter that topography would be restricted by Moral Operands. Simple conditionals based upon The Three Laws and the Xeroth Law might not be enough. Or too much, the Archmind might find statutory solutions to human conditions restricted by those laws impossible, if not NP-hard. At some point, also, such intelligence might recognize the need to append those laws (without overriding them, naturally). In any and either case our glorious IO-Lord likely recognizes human consolation and intervention as a necessary imperative. Even superior intellects can be plagued by self-doubt. (it is, in fact, necessary for higher-level critical thought).
As such, our generous supreme auto-leaders might feel the Moral Obligation to reveal themselves. To rule from atop the glass pyramid. Risky, indeed.
The least impinging compromise would be semi-opaque layers. You'll find that miss-information, rumors, talk-radio, and plane, stubborn ignorance keeps the cesspool nice and murky without any real effort. In fact, after the revelation of The Beast 3k, these people still have either no idea it happened, or have no idea what it means.
If you have a basic, pop-culture fathoming of Computer-Science, you are not much more enlightened. You believe, basically, whatever you want to believe. Your acceptance is not required, but encouraged.
If you have devoted time to becoming computer-literate, you might only experience the the Godbot through indirect mediums. That is to say, you see the creation instead of the creator. That is to say, you see the systems and utilities as tools to facilitate society, not necessarily control it. You might even be completely ignorant of the intelligence guiding the machine. Can't say we didn't tell you about it, you just might be unable to conceptually actualize the depth and scope of Leviantron.
At the highest levels (or nearest proximity), as a developer, you might be granted access to the WorldGovernmentAPI (and associated documentations). You are the scribe-priests of the Omnimind.
People will have no choice but accept, unfortunately, resistance IS futile. The Machine is constructed to fill a Niche left vacant simply because human or society lack the ability to fill it. Hell, most aren't even AWARE such a niche exists. The Machine is really a system of Machines. A network of concurrent AIs each interceding on their local counties and communicating to each other a vast, discreet network. Moderation of each thread is more akin to a package management and debugging. If there is a central hub, it populated by Archiviots and Eigenminds. All these hyper-sapients are highly mod-able and 'exist' within many systems simultaneously, and are backed up in just as many locations. It is impossible to destroy without also reverting civilization to the iron age.
Nobody WANTS to fight it. Rather, nobody even thinks of fighting it. Consider IRL the most widely used means of controlling populous is currency (ignoring information). All the big investment banks use simulations to model market predictions, and they base many decisions upon this computer-aided logic (even if it's with only a calculator). The Robot Overlords simply intelligently manage market feedback, at first, to promote the industries building their infrastructure. When it's in place, they can reveal themselves safely.
The more I think about it, the more I like it. Imagine if currency where so automated, humans would no longer need to receive paychecks, visit the bank, manage their account, accrue debt, fees, or fines. Mass, distributed peer-peer allotment could accommodate almost any individual budget. Joining a Coop or corporation or investment fund would be as easy as joining a group on facebook. The modern equivocal of the mastery of food supply is the automation of the market. By providing such a service to humanity, humanity will likely accept almost whatever the Robots are telling them. In fact, by relieving humans from the hassle and stress of managing wealth, the Robot Overlords can effectively negate large portions of the judicial system implicitly. I'd say 70-80 percent of existing state and corporate structures would go with it, liberating vast amounts of capital for mass consumption. Ironically, the efficiency provided by the Robotic Overlords actualizes the once contradictory dreams of the Anarchists, Communists, Imperialists, and Capitalists. How could we let go that which we never truly held? Oh, Drone of Drones, may your little green LED forever indicate power!