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