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