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