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