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