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