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