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