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