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