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