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