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