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