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