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