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