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