There are a few things to consider in a harsh environment like that. Most of them would have to do with the sun being little more than the size of a big star from earth.
This would be your main concern. You need energy for pretty much everything, especially when counteracting an environment so hostile. That being said, most "Green" options would be unavailable. You have no large bodies of water, so water energy is out of the question. You have no atmosphere so wind energy is out too. And since the sun is little more than a bright star, solar is out as well. Meaning you would entirely need to depend on natural resources. With the lack of (ancient) fauna, fossil fuels would also be non existent.
The only fuels available to you would be the Plutian variety of coal or other flammable natural resource at low-tech, or nuclear at high-tech. I'm no expert on Pluto's composition, so I'm not sure which natural resources would be available.
One possibility would be growing renewable resources along with food production. However much energy would be needed for this as well, and it would be a delicate balance without anything to spare.
Another would be to use natural heat from Pluto's core for energy. But this would be extremely high-tech, and I can't comment on how this could work in practise.
Related to energy, surviving on a planet that is constantly -60 at best is no mean feat. People will need to evolve to adapt to low temperatures, but couldn't do too much with evolving a lower core temperature, as we wouldn't be able to lower it below freezing point for a start. They would mostly need to live in artificially created domes or caves that hold heat. These would need to be heated sparingly to conserve energy, and they would be spaceship-like conditions. With the difference being that Pluto's ground could pull more (heat) energy out of the settlement than space would. They wouldn't get out much to explore, as the harsh environment (even with proper protection) would hurt them quite soon. You could have an underground series of tunnels for transport, and they wouldn't see much of the sky in any case.
Lacking all natural sources of water, to survive on Pluto you would need large amounts of water brought in from wherever these aliens came from. This would be a rare resource, and much of it would be needed for food production and consumption. The size of the settlement(s) you could have would be directly related to the amount of water they are able to bring in, or have available.
Any food production would need to be in enclosed spaces, with no chance of losing water into the ground. These spaces would need to be heated as well, to prevent the crops freezing. Most likely you would need vegetables and the like, and perhaps some livestock, although that would be rare.
Obviously related to energy, the surface of Pluto would be as dark as night at all times. Little sunlight gets there, and with the lack of a moon reflecting the sun at night as well, a dark moonless night is the most you'll get. So your people would evolve to function in low-light environments, but would still need artificial light sources all the time.