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