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