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