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