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