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