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