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