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)(23,27)(24,32)(25,26)(28,31)(29,34)(30,36)(33,35)(6,7)(8,12)(13,15)(14,18)(16,19)(17,20)(21,23,26,31)(22,27,25,28)(24,30,34,33)(29,35,32,36)(5,6,9,7)(8,11,12,10)(13,16,17,18)(14,15,19,20)(21,23)(22,28)(24,33)(25,27)(26,31)(29,35)(30,34)(32,36)(1,2,3,4)(5,7,9,6)(8,11,12,10)(13,14)(15,16)(17,19)(18,20)(21,24)(22,29)(23,30)(25,32)(26,34)(27,35)(28,36)(31,33)(5,8,9,12)(6,10,7,11)(13,16)(14,15)(17,18)(19,20)(21,25,26,22)(23,27,31,28)(24,32,34,29)(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.