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