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