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