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