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