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