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)(13,14,16,18)(15,17,20,19)(21,22,26,29)(23,24,30,27)(25,33,34,28)(31,35,36,32)(1,3,4,2)(5,7,9,12)(6,8,10,11)(13,14)(15,19)(16,18)(17,20)(23,30)(24,27)(31,36)(32,35)(6,10)(7,12)(13,14,16,18)(15,17,20,19)(21,23)(22,27)(24,29)(25,31)(26,30)(28,35)(32,33)(34,36)(5,7)(6,8)(9,12)(10,11)(13,14)(15,17)(16,18)(19,20)(21,24,26,27)(22,23,29,30)(25,32,34,35)(28,31,33,36)(5,8)(6,7)(9,11)(10,12)(13,15,16,20)(14,17,18,19)(21,25,26,34)(22,28,29,33)(23,31,30,36)(24,32,27,35)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.