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