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