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