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