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