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