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