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