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