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