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