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