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