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