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