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