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