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