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