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