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