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