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