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