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