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