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