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