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