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