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