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