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