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