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