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