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