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