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