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