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