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