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