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)(15,23)(16,24)(17,22)(18,21)(19,20)(25,28)(26,27)(1,3,4,2)(5,6)(7,10)(8,12)(9,11)(13,15)(14,16)(17,27)(18,24)(19,25)(20,26)(21,28)(22,23)(7,8)(10,12)(13,16)(14,15)(17,23)(18,28)(19,26)(20,25)(21,24)(22,27) involution — undirected(5,7,9,8)(6,10,11,12)(14,20)(16,26)(21,22)(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.