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