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