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