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