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