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