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