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)(11,17)(15,16)(19,20)(21,22)(23,31)(24,34)(25,29)(26,32)(27,28)(30,36)(33,35) involution — undirected(1,2,4,3)(5,6)(7,15)(8,12)(9,18)(10,13)(11,17)(14,16)(19,20)(21,23,25,28)(22,27,29,31)(24,32,35,30)(26,34,36,33)(5,7,8,17,10,16,9,19)(6,11,12,14,13,20,18,15)(21,24,26,27,25,35,36,31)(22,28,30,34,29,23,32,33)(1,3,4,2)(7,16)(11,20)(14,15)(17,19)(22,29)(24,35)(27,31)(30,32)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.