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