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)(9,13)(10,14)(11,16)(17,20)(18,19)(21,22)(23,31)(24,34)(25,28)(26,30)(27,29)(32,33)(35,36)(7,16)(8,17)(11,15)(12,20)(21,23,28,27)(22,29,25,31)(24,32,30,35)(26,33,34,36)(5,7,10,16)(6,11,14,15)(8,9,17,19)(12,18,20,13)(21,24)(22,26)(23,32)(25,34)(27,35)(28,30)(29,33)(31,36)(5,8,10,17)(6,12,14,20)(7,9,16,19)(11,18,15,13)(21,25,28,22)(23,29,27,31)(24,34,30,26)(32,33,35,36)(5,9)(6,13)(7,17)(8,16)(10,19)(11,12)(14,18)(15,20)(21,26,28,34)(22,30,25,24)(23,33,27,36)(29,35,31,32)(5,6)(7,11)(8,12)(9,18)(10,14)(13,19)(15,16)(17,20)(21,27,28,23)(22,29,25,31)(24,35,30,32)(26,33,34,36)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.