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