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