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