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