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