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