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