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