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