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