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