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