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