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