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