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