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