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