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