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