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