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