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