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