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