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