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