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