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