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