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