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