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