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