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