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