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