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