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