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