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