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