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