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