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