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