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