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