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