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