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