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