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