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