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