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