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