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