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