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