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