Provided it is only faded and not damaged or out of shape, there are many DIY videos and materails available to help.
One thing I have noticed is that the roof stays in better shape if it is not left in the down folded position for extended periods.
I do not have direct experience or recommendations, but it appears you need to do a thorugh cleaning, then there are different color coatings to "renew" the roof.
Looks like a fairly easy DIY project. Just be sure to get the coating intended for a canvas roof (assuming all F-Types have canvas). If not sure anbout canvas, theer are also videos to help you determine canvas vs plastic/rubber. Good luck.