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