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