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