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)(13,14,18,22,19,15,17,21)(16,24,28,23,27,25,26,20)(5,7,8,11)(6,9,10,12)(13,15,19,14)(16,23,27,20)(17,21,18,22)(24,26,25,28)(6,10)(9,12)(13,14,19,15)(16,25,27,24)(17,22,18,21)(20,28,23,26)(2,4)(13,16)(14,20)(15,23)(17,28)(18,26)(19,27)(21,24)(22,25) 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.