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