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