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