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