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