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