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