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