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