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