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