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