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