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)(21,22,24,30)(23,31,32,27)(25,28,26,29)(33,36,34,35)(6,9)(10,12)(13,14)(15,18)(16,17)(19,20)(21,23,24,32)(22,27,30,31)(25,33,26,34)(28,35,29,36)(2,4)(5,7,8,11)(6,10,9,12)(14,17)(18,20)(22,28)(25,26)(27,35)(29,30)(31,36)(33,34)(13,15,16,19)(14,18,17,20)(22,29)(25,26)(27,36)(28,30)(31,35)(33,34)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.