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