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