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