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)(15,21)(18,27)(22,28)(23,25)(2,3)(6,10)(11,12)(13,14)(15,22)(16,24)(17,19)(18,23)(20,26)(21,28)(25,27) involution — undirected(1,2,4,3)(5,7,9,8)(6,11,10,12)(13,14)(15,18)(16,20)(17,19)(21,27)(22,23)(24,26)(25,28)(1,3,4,2)(5,7,9,8)(6,11,10,12)(13,15)(14,18)(16,25)(17,21)(19,27)(20,28)(22,24)(23,26)(5,8,9,7)(6,11,10,12)(14,19)(18,27)(20,24)(22,28)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.