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