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