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