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)(17,20)(18,22)(19,26)(21,28)(23,25)(24,27)(5,7)(6,10)(8,11)(9,12)(13,15,17,23,18,24,28,19)(14,16,20,25,22,27,21,26)(2,4)(5,8,9,6)(7,11,12,10)(13,16)(14,15)(17,26)(18,27)(19,20)(21,23)(22,24)(25,28)(7,12)(10,11)(13,16)(14,19)(15,20)(17,25)(18,27)(21,24)(22,23)(26,28) 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.