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