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