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