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