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