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