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