Strangely, I've never aquired a Caedeus set, I don't particularly like fighting Ceadeus, you can generally only got 2 or 3 skills onto a Ceadeus set without a god charm.
The material farming is worth it if you use a hammer I guess (though I just used Jhen+) but it's all mostly Jhen+, Lagi+ and Ceadeus with some other gems (iirc)
Elaborating slightly on what Win said, the exact mix for the Ceadeus armor combo you want without negative skills goes like:
Helios Vambraces (-)
Helios Coil (-)
Helios Leggings (-)
The defense is equal to that of Jhen+ and Escadora, since Ceadeus is a grand dragon, so you get a total defense of around 462 (or something similar).