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