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