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