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