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