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