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