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