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