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