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)(15,20)(16,18)(21,22)(23,24)(25,28)(26,27) involution — undirected(5,7)(6,8)(9,11)(10,12)(13,14,17,19)(15,18,20,16)(21,22,25,28)(23,24,27,26)(13,15)(14,18)(16,19)(17,20)(21,23)(22,26)(24,28)(25,27) involution — undirected(1,2,3,4)(5,7)(6,10)(8,12)(9,11)(13,15)(14,18)(16,19)(17,20)(21,23)(22,24)(25,27)(26,28)(5,8,9,10)(6,11,12,7)(13,16,17,18)(14,15,19,20)(21,24)(22,27)(23,28)(25,26)A 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.