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