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