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