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