If you want to fully restore it a specialist bike sprayer like argos will do it in any colour you like, expensive though
Alternatively you could source a local powder coater for a tougher finish and cheaper but not quite as good. There are also powder coaters who have experience with bike and can provide a better result.
But the best thing to do with a cannondale is polish it they look great with a bit of rubbing, if you click the link below my post that says cannondale you will see my old one.
i think im going to go with the polish
now please does anyone have some instructions on how i cand do this as i am a complete beginner to this kind of thing