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