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