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