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