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