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