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