One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,15)(13,16)(17,18,21,23)(19,24,27,31)(20,25,28,30)(22,26,29,32)(2,5)(6,8)(9,11,13,12)(10,14,16,15)(18,23)(19,25)(20,24)(22,29)(27,30)(28,31)(9,11,13,12)(10,15,16,14)(17,19)(18,24)(20,26)(21,27)(22,30)(23,31)(25,29)(28,32)(9,12,13,11)(10,15,16,14)(17,20)(18,25)(19,26)(21,28)(22,31)(23,30)(24,29)(27,32)(1,3,4,7)(2,6,5,8)(18,23)(20,28)(24,31)(26,32)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.