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