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