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