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)(21,22,25,27)(23,29,31,36)(24,34,33,28)(26,35,32,30)(1,2,4,3)(6,9)(10,12)(13,15)(14,17)(16,19)(18,20)(22,27)(23,31)(24,33)(30,35)(1,3,4,2)(15,19)(17,20)(21,23,32,24,25,31,26,33)(22,28,35,36,27,34,30,29)(5,7,8,11)(6,10,9,12)(21,24,32,31,25,33,26,23)(22,29,35,28,27,36,30,34)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.