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