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