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