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