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