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