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