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