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