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