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