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