Since the availability of real photos are limited, I have taken a few screenshots from SpaceEngine, whose rendering and visualization I find to be pretty good.
Here is a shot of Titans shadow falling onto Saturn. Titan (just like the majority of Saturns moons) orbits within Saturns ring plane. The eclipse zone on the 'surface' of Saturn will most commonly lie along the intersection of Saturns orbital plane, and the ring plane, so the shadow will commonly lie across the rings as shown. The shadow from highly eccentric and/or remoter moons may miss the ring plane, as shown in the photo in the other answer.
From the surface of saturn, in the center of the shadow, it looks like this:
I'm not entirely convinced SpaceEngine is rendering the occuluded glare around the sun correctly. The center of the shadow is a tiny bit above the ring plane in the first screenshot, but in the second, the eclipse seems visible from much higher latitude. I think this is a more realistic visualization of the ring illumination when located at the center of the shadow, but of curse, the sun glare here should be obscured:
If I move the camera further out, inside the shadow cone, towards Titan, I need to be far beyhond the rings before titan fully eclipses the sun in SpaceEngine. I don't know what the relative size of Titan and the Sun are from Saturns surface, but it should be easy enough to calculate.
Here is a dramatic shot taken from a higher latitude, a bit outside the zone of totality:
And a shot from close to the pole, with Titans position marked:
Screenshots are taken from the free http://spaceengine.org program. Titans shadow on Saturns rings is one of the preset scenarios if you want to explore some more.