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