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