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