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