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