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