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