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