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