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