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