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