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