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