You might want to hold off on that, Nate. The heat created by a laser printer will melt any styrene thin enough to print on and then you will have a real mess on your hands.
But, you might try printing to a white decal paper, like Microscale's white trim film or Bare Metal Foil's blank white stock. Then you could apply the decal directly to the styrene substrate. However, you'd want to make sure the styrene model is evenly primed with white paint, because none of these decal films are totally opaque.
I will likely stick with the actual paper itself instead of decals, but the decal option is something you might consider instead of ruining a laser printer.