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