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