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