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