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