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