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