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