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