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