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