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