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