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