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