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