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