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