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