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