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