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