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