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