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