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