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