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