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