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