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