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)(21,22,26,28,24,29,25,30)(23,31,32,35,33,27,34,36)(1,2)(3,4)(6,10)(11,12)(13,15,17,16)(14,18,19,20)(21,23,26,32,24,33,25,34)(22,27,28,36,29,31,30,35)(2,4)(5,7,9,8)(6,11,10,12)(13,16,17,15)(14,18,19,20)(22,28)(23,32)(25,26)(27,31)(29,30)(33,34)(5,8,9,7)(6,11,10,12)(22,29)(23,33)(28,30)(32,34)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.