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