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