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