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