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