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)(12,16)(13,15)(17,18,23,19,22,25,21,27)(20,28,30,29,31,24,32,26)(9,11,14,10)(12,16,13,15)(17,18,23,19,22,25,21,27)(20,24,30,26,31,28,32,29)(2,5)(6,8)(9,12,14,13)(10,15,11,16)(17,19,23,25,22,27,21,18)(20,29,30,24,31,26,32,28)(9,12,14,13)(10,16,11,15)(17,20)(18,24)(19,26)(21,32)(22,31)(23,30)(25,28)(27,29)(1,3,4,7)(2,6,5,8)(9,13,14,12)(10,16,11,15)(17,21,22,23)(18,19,25,27)(20,30,31,32)(24,29,28,26)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.