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