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