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