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