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