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