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