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