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)(15,23)(16,20)(17,19)(18,27)(21,26)(22,25)(24,28) involution — undirected(2,4)(6,9)(10,12)(14,19)(15,24)(16,26)(18,25)(20,23)(21,28) involution — undirected(5,7,8,11)(6,10,9,12)(13,15,25,24,17,26,18,16)(14,20,27,21,19,28,22,23)(1,2,3,4)(13,16,18,26,17,24,25,15)(14,21,22,20,19,23,27,28)(6,9)(10,12)(14,19)(20,28)(21,23)(22,27) 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.