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