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