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