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