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