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