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