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