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