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