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