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