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