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