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