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