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