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