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