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