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