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