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