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