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