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