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