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