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