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