One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6)(7,11)(8,10)(9,13)(12,16)(14,18)(15,17)(19,20)(21,22)(23,31)(24,29)(25,28)(26,30)(27,33)(32,35)(34,36)(6,10)(8,16)(11,17)(12,13)(15,20)(18,19)(21,23)(22,27)(24,34)(25,33)(26,32)(28,35)(29,31)(30,36) involution — undirected(5,7,9,14)(6,11,13,18)(8,15,16,20)(10,17,12,19)(22,28)(24,25)(27,35)(29,30)(31,36)(33,34)(1,3,4,2)(7,14)(11,18)(15,20)(17,19)(23,32)(27,36)(31,35)(33,34)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.