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