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