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