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