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