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