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