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