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