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