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