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