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