What does it mean if your bearded dragons color fades?

If you mean what I think you mean he will most likely shed soon , after he sheds he will have his original colors again.

make sure he has a rock or branch to scrub against for easy shedding.

DO NOT try the pull off loose pieces of half shedded skin, this can cause serious injury to your bearded dragon

if he has trouble shedding spray some warm water in his enclosure , this will help