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)(21,22,25,30)(23,27,26,29)(24,32,34,35)(28,33,36,31)(5,6,8,9)(7,10,11,12)(13,15)(14,17)(16,19)(18,20)(21,23,25,26)(22,27,30,29)(24,31,34,33)(28,35,36,32)(2,4)(5,7,8,11)(6,10,9,12)(15,19)(17,20)(22,27)(23,26)(28,35)(29,30)(31,33)(32,36)(6,9)(10,12)(21,24,25,34)(22,28,30,36)(23,31,26,33)(27,35,29,32)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.