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