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