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