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