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