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