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