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