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