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