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