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