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