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)(12,19)(13,23)(18,32)(20,28)(21,27)(24,29)(25,30)(26,34)(31,33)(35,36) involution — undirected(5,7,9,19,11,21,10,20)(6,12,15,17,16,28,14,27)(8,18,23,33,24,34,25,35)(13,26,22,31,30,32,29,36)(1,2,3,4)(5,8)(6,13)(7,18)(9,23)(10,25)(11,24)(12,26)(14,29)(15,22)(16,30)(17,31)(19,33)(20,35)(21,34)(27,36)(28,32) involution — undirected(5,9,11,10)(6,14,16,15)(7,19,21,20)(8,23,24,25)(12,27,28,17)(13,29,30,22)(18,33,34,35)(26,36,32,31)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.