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