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