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)(13,14,17,15,19,22,18,20)(16,24,25,28,26,23,27,21)(6,9)(10,12)(13,15,18,14,19,20,17,22)(16,23,25,21,26,24,27,28)(2,4)(5,7)(6,10)(8,11)(9,12)(14,20)(15,22)(17,18)(21,24)(23,28)(25,27) involution — undirected(7,11)(10,12)(13,16)(14,21)(15,23)(17,27)(18,25)(19,26)(20,24)(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.