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