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