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