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