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)(15,19,20,17)(21,22)(23,31)(24,29)(25,27)(26,30)(28,33)(32,35)(34,36)(5,7)(6,10)(8,11)(9,12)(13,15,16,20)(14,17,18,19)(22,27)(23,32)(24,26)(28,35)(31,36)(33,34)(5,8,9,6)(7,11,12,10)(14,18)(17,19)(21,23)(22,28)(24,32)(25,33)(26,34)(27,31)(29,36)(30,35)(2,4)(7,12)(10,11)(15,20)(17,19)(21,24,25,26)(22,29,27,30)(23,32,33,34)(28,36,31,35)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.