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