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