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