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