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