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