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)(13,14,17,21)(15,22,24,28)(16,19,25,20)(18,26,27,23)(5,7,9,12)(6,10,8,11)(13,15,16,23,17,24,25,26)(14,18,20,22,21,27,19,28)(5,8,9,6)(7,11,12,10)(14,19)(16,25)(18,22)(20,21)(23,26)(27,28)(2,4)(7,12)(10,11)(13,15)(14,18)(16,26)(17,24)(19,22)(20,28)(21,27)(23,25) 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.