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