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