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