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