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