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)(9,18)(10,13)(11,15)(16,19)(17,20)(21,22)(23,26)(24,27)(25,29)(28,32)(30,34)(31,33)(35,36)(5,7,8,17,10,16,9,15)(6,11,18,19,13,20,12,14)(21,23)(22,26)(24,31)(25,30)(27,33)(28,35)(29,34)(32,36)(5,6)(7,11)(8,18)(9,12)(10,13)(14,15)(16,20)(17,19)(22,27)(24,32)(26,33)(28,29)(31,36)(34,35) involution — undirected(1,3,4,2)(5,8,10,9)(6,12,13,18)(7,15,16,17)(11,19,20,14)(23,30)(26,34)(31,36)(33,35)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.