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