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