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