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