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