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