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