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