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