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)(21,22,26,31,27,32,25,30)(23,28,33,29,24,34,35,36)(1,2)(3,4)(5,7,16,18,10,17,9,8)(6,11,19,12,14,20,13,15)(21,23)(22,28)(24,27)(25,35)(26,33)(29,31)(30,36)(32,34)(2,4)(21,24,27,23)(22,29,32,36)(25,35,26,33)(28,30,34,31)(5,8,9,17,10,18,16,7)(6,12,13,11,14,15,19,20)(21,25,27,26)(22,30,32,31)(23,33,24,35)(28,29,34,36)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.