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