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