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