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