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)(9,11,13,12)(10,14,15,16)(17,18)(19,26)(20,23)(21,25)(22,28)(24,31)(27,29)(30,32)(1,3,5,4)(2,7,6,8)(10,15)(14,16)(17,19,21,29)(18,22,25,32)(20,30,31,28)(23,26,24,27)(9,12,13,11)(10,16,15,14)(17,18)(19,27)(20,23)(21,25)(22,30)(24,31)(26,29)(28,32)(1,4,5,3)(2,8,6,7)(18,23)(20,31)(22,26)(24,25)(27,32)(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.