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