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