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