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