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