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