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