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