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