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