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