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