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