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