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