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