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