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