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