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