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