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