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)(15,21,25,28)(16,24,26,19)(17,27,23,22)(1,2)(3,4)(5,7)(6,9)(8,11)(10,12)(13,15,23,16,18,25,17,26)(14,19,27,28,20,24,22,21)(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)(15,25)(16,26)(22,27) involution — undirected(13,16,17,15,18,26,23,25)(14,21,22,24,20,28,27,19)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.