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