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