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