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