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