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