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)(14,17)(18,19)(21,22,25,29)(23,30,32,36)(24,28,26,34)(27,31,35,33)(6,9)(10,12)(13,14,16,17)(15,19,20,18)(21,22)(23,27)(24,34)(25,29)(26,28)(30,33)(31,36)(32,35)(7,11)(10,12)(13,15)(14,18)(16,20)(17,19)(21,23,25,32)(22,27,29,35)(24,33,26,31)(28,36,34,30)(2,4)(5,7,8,11)(6,10,9,12)(15,20)(18,19)(21,24,25,26)(22,28,29,34)(23,31,32,33)(27,30,35,36)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.