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