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