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