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