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