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