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