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