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