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)(9,14)(10,13)(15,17)(16,24)(18,25)(19,26)(20,28)(21,27)(22,30)(23,29)(31,33)(32,35)(34,36)(5,6)(7,15,17,11)(8,12)(9,14)(10,13)(16,26,19,24)(18,31,33,25)(20,28)(21,27)(22,30)(23,29)(32,36,34,35)(2,4)(5,7,9,18,10,17,23,33)(6,11,14,25,13,15,29,31)(8,19,20,34,21,16,22,32)(12,26,28,36,27,24,30,35)(5,8,10,21)(6,12,13,27)(7,16,17,19)(9,22,23,20)(11,24,15,26)(14,30,29,28)(18,34,33,32)(25,36,31,35)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.