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