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