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