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