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