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