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