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