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