One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(10,14,15,16)(17,18,21,25,22,26,19,23)(20,28,27,32,29,24,30,31)(2,5)(6,8)(17,19,22,21)(18,23,26,25)(20,27,29,30)(24,31,28,32)(1,3,4,7)(2,6,5,8)(9,10)(11,14)(12,16)(13,15)(17,20)(18,24)(19,27)(21,30)(22,29)(23,31)(25,32)(26,28)(9,11,13,12)(10,14,15,16)(17,19,22,21)(18,25,26,23)(20,27,29,30)(24,32,28,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.