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