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