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