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)(16,23)(17,21)(19,22)(20,26)(24,27)(25,28)(2,4)(5,7,9,8)(6,10,12,11)(13,15,18,14)(16,21,26,24)(17,23,27,20)(19,22,28,25)(5,7,9,8)(6,11,12,10)(13,16,18,26)(14,20,15,23)(17,19,27,28)(21,25,24,22)(5,8,9,7)(6,11,12,10)(13,17)(14,21)(15,24)(16,19)(18,27)(20,25)(22,23)(26,28)(14,15)(20,23)(21,24)(22,25) 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.