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)(25,36)(26,29)(27,32)(28,35)(30,33)(31,34) involution — undirected(1,2,3,4)(5,7)(6,10)(8,14)(9,13)(11,17)(12,18)(15,20)(16,19)(21,23,25,32,26,31,33,28)(22,27,30,24,29,35,36,34)(6,11)(7,13)(12,15)(14,19)(21,24,33,27,26,34,25,35)(22,28,36,31,29,32,30,23)(7,13)(10,17)(14,19)(18,20)(23,31)(24,34)(27,35)(28,32) involution — undirected(5,8,9,16)(6,12,11,15)(7,14,13,19)(10,18,17,20)(22,29)(24,34)(27,35)(30,36)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.