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