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