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