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