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