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