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