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