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