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