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