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