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