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