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