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