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