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