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