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