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