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