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