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