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)(27,32)(33,36)(34,35)(5,7,9,15)(6,10,12,19)(8,17,18,14)(11,20,16,13)(21,23,26,34)(22,27,30,36)(24,33,25,32)(28,35,29,31)(22,28)(24,25)(27,35)(29,30)(31,36)(32,33) involution — undirected(1,3,4,2)(21,24,26,25)(22,29,30,28)(23,32,34,33)(27,35,36,31)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.