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