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