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