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