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