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