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