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