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