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)(15,16)(17,22)(18,23)(19,24)(20,26)(21,28)(25,27)(1,2)(3,4)(6,10)(11,12)(13,14)(15,25)(16,27)(17,22)(18,23)(19,24)(20,21)(26,28) involution — undirected(5,7,9,8)(6,11,10,12)(13,15,17,26,19,27,18,21)(14,20,23,16,24,28,22,25)(2,4)(5,7,9,8)(6,11,10,12)(13,16,17,28,19,25,18,20)(14,21,23,15,24,26,22,27)(5,8,9,7)(6,11,10,12)(13,17,19,18)(14,22,24,23)(15,26,27,21)(16,20,25,28)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.