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