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