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