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