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