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