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