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