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