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