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