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)(21,22,26,30,27,24,25,29)(23,28,33,31,34,35,32,36)(5,7,9,8,10,16,19,17)(6,11,13,15,14,20,18,12)(21,23,26,33,27,34,25,32)(22,28,30,31,24,35,29,36)(2,4)(21,24,27,22)(23,31,34,36)(25,29,26,30)(28,32,35,33)(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.