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